HK1102864B - Method of and drive for recording medium defect management, and defect managed recording medium - Google Patents

Description

Method and drive for defect management of recording medium, and defect managed recording medium

The present application is a divisional application of an invention patent application having an application date of 2004, 4/22, application No. 200480001804.8, entitled "method and drive for recording medium defect management, and recording medium for defect management".

Technical Field

The present invention relates to a defect management method for a recording medium, a recording medium drive, and a recording medium therefor, and more particularly, to a defect management method in which a first temporary defect management area and a second temporary defect management area are recorded on a recording medium.

Background

Defect management is a process of overwriting data stored in a user data area of a disc having a defect in a new portion of the user data area, thereby compensating for data loss caused by the defect.

In general, defect management is performed using linear replacement or slipping replacement. In the linear replacement, a user data area in which a defect exists is replaced with a spare data area having no defects. In slipping replacement, a user data area having a defect is slipped and a next user data area having no defects is used.

However, both the linear replacement and the slipping replacement can be applied only to a disc such as a DVD-RAM/RW on which data can be repeatedly recorded and recording can be performed using a random access method.

In the case of Write Once Read Many (WORM) storage media (hereinafter, referred to as "write once recording media"), data cannot be rewritten to the same location because of the limited recording capacity of these media. Therefore, effective defect management is required, and many efforts have been made to develop a defect management method for write-once recording media by using a recording medium drive.

Defect management is performed on the write-once recording medium using a verify-after-write method. More specifically, the recording medium drive records data on the write-once recording medium in a specific unit, and then verifies the recorded data to detect the location of a portion of the medium in which a defect exists. Next, the drive re-records the data recorded in the portion having the defect in the spare area. Then, the drive creates a temporary defect list (TDFL) describing the locations of the area having the defect and a spare area for replacing the area having the defect, and creates temporary defect management information (TDDS) defining the recording location of the TDFL. The combination of the TDFL and the TDDS is called a Temporary Defect Management Structure (TDMS).

Next, when the amount of information stored in the memory reaches a predetermined level, the drive stores the created TDFL or TDDS in the memory and records the stored information in a Temporary Defect Management Area (TDMA) of the write-once recording medium. The TDMS is updated whenever data is recorded on the write once recording medium.

The write-once recording medium is completed when data cannot be recorded on the write-once recording medium any more or a user does not want to record data thereon any more. During finalization of the write once recording medium, the TDMS lastly recorded in the TDMA is copied to a Defect Management Area (DMA).

However, when the power supply to the recording medium drive is interrupted due to an abnormal event such as a power failure, defect management performed by the recording medium drive on the write once recording medium is abnormally suspended. For example, the recording medium drive may be subjected to power shortage before recording a TDFL or a TDDS, which is created when recording data on the write once recording medium, in the TDMA. In this case, the TDMS will not be successfully updated. In addition, when the write once recording medium is reloaded into the recording medium drive after power restoration, the drive cannot check whether defect management has been abnormally terminated.

Disclosure of Invention

The present invention provides a defect management method for a write once recording medium during which abnormal termination of defect management due to an abnormal event by way of non-limiting example of a power shortage is checked.

The present invention also provides a recording medium drive capable of easily checking abnormal termination of defect management caused by an unavoidable accident.

The present invention also provides an information storage medium in which abnormal termination of defect management caused by an unavoidable accident can be easily checked.

According to an aspect of the present invention, there is provided a defect management method for an information storage medium, including: writing first state information specifying an update cycle of a Temporary Defect Management Structure (TDMS) when an update of the TDMS starts, the TDMS containing information on temporary defect management; updating the TDMS when data is written to or read from the information storage medium; and writing second state information specifying that the update cycle of the TDMS is closed when the updating of the TDMS is completed.

The first state information may be written in response to a command to open a TDMS update cycle or a command to write data to or read data from the information storage medium.

The updating step may include writing the state information based on the updated TDMS.

The second state information may be written in response to a command to eject the information storage medium.

According to another aspect of the present invention, there is provided a defect management method for an information storage medium, the method including: writing first state information, which specifies that an update cycle of data is open, in an area of an information storage medium when updating of the data starts during writing of the data to or reading of the data from the information storage medium; updating predetermined data generated when data is written to or read from the information storage medium by writing the data to the information storage medium; and writing second state information specifying that an update cycle of the data is closed in the area when the update of the information is completed.

According to another aspect of the present invention, there is provided a driver including: a pickup writing data to or reading data from a loaded information storage medium; and a controller controlling the pickup to write first state information specifying that a Temporary Defect Management Structure (TDMS) update cycle is open in an area of the information storage medium when an update of the TDMS containing information on temporary defect management starts; controlling the pickup to update the TDMS when data is written to or read from the information storage medium; and controlling the pickup to write second state information specifying that the TDMS update cycle is closed in the area when the updating of the TDMS is completed.

The controller may control the pickup to write the first state information to the area in response to a command to open the TDMS update cycle or a write/read command.

The controller may control the pickup to write the first state information to the area based on the updated TDMS when the TDMS is updated during writing of data to or reading of data from the information storage medium.

The controller may control the pickup to write the second state information in the area in response to a command to eject the information storage medium or a command to close the TDMS update cycle.

According to another aspect of the present invention, there is provided a driver including: a pickup writing data to or reading data from a loaded information storage medium; and a controller that: controlling the pickup to write first state information specifying that an update cycle of information is open in an area of the information storage medium when updating of the information starts during writing of data to or reading of data from the information storage medium; controlling the pickup to update predetermined data generated when data is written to or read from the information storage medium by writing information to the information storage medium; and controlling the pickup to write second state information specifying that an update period of the information is turned off in the area when the updating of the information is completed.

According to another aspect of the present invention, there is provided an information storage medium including a lead-in area, user data, and a lead-out area, on which a Temporary Defect Management Structure (TDMS) containing information regarding temporary defect management and update cycle state information regarding the TDMS are written, the update cycle state information specifying that an update cycle of the TDMS is opened or closed.

The TDMS may contain temporary defect management information (TDDS) and a temporary defect list (TDFL), and the TDMS update cycle state information is contained in the TDDS.

At least one TDMA may be formed in at least one of the lead-in area, the user data area, and the lead-out area, and the TDMS update cycle state information may be written in the TDMA.

According to another aspect of the present invention, there is provided an information storage medium comprising: information involved and generated during writing of data or reading of written data; and update cycle state information specifying whether an update cycle of the information is turned on or off and written based on the information.

According to another aspect of the present invention, there is provided a method of determining whether recording of data on an information storage medium is abnormally terminated due to an abnormal event. The method comprises the following steps: when the updating of the TDMS is completed, second state information specifying that an update cycle of the TDMS is closed is read. When an update of a Temporary Defect Management Structure (TDMS) is started, first state information specifying that an update cycle of the TDMS is open is written, the TDMS containing information on temporary defect management. The TDMS is updated when data is written to or read from the information storage medium.

Additional and/or other aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

These and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

fig. 1 illustrates a data structure of a single recording layer of a write once recording medium according to an embodiment of the present invention;

fig. 2 illustrates an example of a data structure of information recorded in a Temporary Defect Management Area (TDMA);

fig. 3 illustrates an example of a data structure of temporary defect management information (TDDS);

fig. 4 is a block diagram of a drive performing defect management on a write once recording medium according to an embodiment of the present invention;

FIG. 5 is a detailed block diagram of the driver shown in FIG. 4;

fig. 6 illustrates a state of a write once recording medium on which defect management is performed according to an embodiment of the present invention; and

fig. 7 is a flowchart of a defect management method for an information storage medium according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

In this disclosure, defect management according to various embodiments of the present invention is described with respect to a write-once recording medium as an example of an information storage medium. However, it will be understood that other media may be used.

Fig. 1 illustrates a data structure of a single recording layer representation of a write-once recording medium according to an embodiment of the present invention. Referring to fig. 1, the write once recording medium includes a lead-in area, a data area, and a lead-out area. The lead-in area includes a Defect Management Area (DMA) #1, a DMA #2, a write condition test area, a first Temporary Defect Management Area (TDMA), and a drive information area.

In the data area, a spare area #1, a spare area #2, a second TDMA, and a user data area are formed. In the lead-out area, DMA #3 and DMA #4 are formed.

Generally, a rewritable recording medium includes DMAs but does not include Temporary DMAs (TDMAs), however, TDMAs are additionally allocated to the write-once recording medium in addition to DMAs due to the characteristics of the write-once recording medium.

More specifically, in the case of a write-once recording medium, data recording is not permitted at a position where data has been recorded. Accordingly, when information regarding a newly generated defect needs to be updated during data recording, the recording medium drive reads the last recorded defect information and updates the current defect information by additionally recording the newly generated defect information in a new cluster. For this reason, when data is recorded more frequently on the write-once recording medium, the amount of defect information accumulates and becomes more.

Meanwhile, since the DMA formed in the conventional recording medium has a small recording capacity, the DMA can be used as an area in which defect management is performed. Therefore, a TDMA, whose recording capacity is larger than that of the DMA, is additionally allocated to the write-once recording medium.

During finalization of the write once recording medium, a Temporary Defect Management Structure (TDMS) lastly recorded in the TDMA is recorded in the DMA. In this way, it is possible to record data on the write-once recording medium using the recording medium drive and reduce the time spent on initialization of the write-once recording medium.

Initialization of the recording medium is a process of reading data from a lead-in area or a lead-out area and determining how to manage the recording medium and write or read data to or from the recording medium. Therefore, when the amount of information recorded in the lead-in area or the lead-out area of the recording medium increases, more time is spent on initialization of the recording medium after the recording medium is loaded into the recording medium drive. The speed of searching for data recorded in the DMA is still faster than the speed of searching for data recorded in the TDMA having a large recording capacity.

Referring to fig. 1, the write once recording medium includes two TDMAs, i.e., a first TDMA and a second TDMA, in which a TDMS is recorded. As mentioned above, the TDMS contains a temporary defect list (TDFL) and temporary defect management information (TDDS). The TDFL specifies the location of an area having a defect and a spare area replacing the area having the defect, and the TDDS specifies the recording location of the TDFL.

In addition to the TDDS and TDFL, the TDMS includes: a Space Bit Map (SBM) using bit values to indicate whether data is recorded in a cluster including the entire recording area constituting the write-once recording medium. The SBM is recordable in an additional cluster or in a cluster containing the TDMS.

The inclusion of the second TDMA in the data area is optional according to the decision of a user or a drive manufacturer. The reason why the inclusion of the second TDMA is decided according to a user or a drive producer is to enable the user/disc producer to properly use the write-once recording medium.

When defect management is performed using a recording medium drive, spare areas #1 and #2 are allocated to a data area during initialization of the write once recording medium.

Fig. 2 illustrates an example of a data structure of information recorded in the TDMA. Referring to fig. 2, the TDDS and TDFL are recorded in the TDMA in cluster units. In the TDMA, an area in which the TDDS is recorded and an area in which the TDFL is recorded are not additionally separated, i.e., they are recorded in the same space of the TDMA. Accordingly, the respective TDDS and TDFL are recorded in units of at least one cluster in the order in which they are generated (N and k are integers greater than 1).

Fig. 3 illustrates an example of a data structure of the TDDS shown in fig. 2. Referring to fig. 3, a TDDS # i (i is an integer greater than 0) specifies the location of a recordable write condition test area, the location of a TDFL # i corresponding to the TDDS # i, write protection information, the number of updates indicating the number of updating TDDS # i, the size of spare areas #1 and #2 allocated to a data area, C _ flag, and the like.

As used in this detailed description, C _ flag represents a "consistency" flag "indicating the status of the TDMS update cycle. The C _ flag will be described in detail later.

Although not shown in the drawings, according to this embodiment of the present invention, an area formed in a single recording layer of the write once recording medium of fig. 1 is also included in a dual recording layer of the write once recording medium. In the dual recording layer of the write-once recording medium, an inner area #0, a data area #0, and an outer area #0 are sequentially formed in the first recording layer from an inner portion to an outer portion of the first recording layer, and an outer area #1, a data area #1, and an inner area #1 are sequentially formed in the second recording layer from an inner portion to an outer portion of the second recording layer.

Therefore, defect management according to this embodiment of the present invention is executable in a write once recording medium having dual recording layers. The first TDMA of the second recording layer may be used when the first TDMA of the first recording layer is full of data, and the second TDMA of the second recording layer may be used when the second TDMA of the first recording layer is full of data.

Fig. 4 is a block diagram of a drive performing defect management on a write once recording medium according to an embodiment of the present invention. Referring to fig. 4, the apparatus includes a recording/reading unit 1, a controller 2, and a memory 3.

The recording/reading unit 1 writes data in a write-once recording medium 4, which is an information storage medium, and reads back the data from the write-once disc 4 to verify the written data.

The controller 2 performs defect management on data recorded on the write once recording medium 4 using a TDMA formed in the write once recording medium 4.

In this embodiment, the controller 2 uses a verify-after-write method in which data is written on the write-once recording medium 4 in specific units and the written data is verified to detect an area of the write-once recording medium 4 having a defect. More specifically, the controller 2 writes user data on the write once recording medium 4 in specific units, verifies the written user data to detect an area of the write once disc 4 in which a defect exists, and creates a TDFL and a TDDS describing the location of the area having the defect. Next, the controller 2 stores the created TDFL and TDDS in the memory 3. If the amount of stored information reaches a predetermined level, the controller 2 writes the stored information in the TDMA of the write once recording medium 4.

Fig. 5 is a detailed block diagram of a drive performing defect management on a write once recording medium as shown in fig. 4 according to an embodiment of the present invention. Referring to fig. 5, the recording medium drive includes a pickup 10 corresponding to the recording/reading unit 1 of fig. 4. The write once recording medium 4 is loaded into the pickup 10. In addition, the driver includes a controller 2, and in the controller 2, a PC I/F21, a Digital Signal Processor (DSP)22, a Radio Frequency (RF) Amplifier (AMP)23, a servo 24, and a system controller 25 are installed. The memory 3 is included in the system controller 25 of the controller 2.

During a write operation, the PC I/F21 receives data to be recorded and a write command from a host (not shown). The system controller 25 initializes the write-once recording medium 4 required for the write operation. The DSP22 receives data to be recorded from the PC I/F21; error Correction Coding (ECC) encodes data by incorporating additional data into the data, such as parity for error correction; and modulating the ECC-encoded data using a specific method. The RF AMP23 converts the data output from the DSP22 into an RF signal. The pickup 10 writes the RF signal output from the RF AMP23 in the write-once recording medium 4. The servo 24 receives a servo control command from the system controller 25 and performs servo control on the pickup 10. In addition, in order to perform defect management during a write operation, the system controller 25 instructs the pickup 10 to read data from the write once recording medium 4 or to write information, such as temporary management information, in the write once recording medium 4.

In addition, the system controller 25 instructs the pickup 100 to write a TDMS containing a TDDS and a TDFL, which is lastly recorded in the TDMA, so that the write once recording medium 4 is finalized when a user command is given or a predetermined disc finalization condition is satisfied.

During a read operation, the PC I/F21 receives a read command from the host. The system controller 25 performs disc initialization required for a read operation. The pickup 10 irradiates a laser beam on the write-once recording medium 4, and obtains and outputs an optical signal from the laser beam reflected from the write-once recording medium 4. The RF amplifier 23 converts the optical signal output from the pickup l0 into an RF signal, supplies data modulated from the RF signal to the DSP22, and supplies a servo signal obtained from the RF signal for servo control to the servo 24. The DSP22 demodulates the modulated data, performs ECC encoding on the demodulated data, and outputs ECC encoded data. The servo 24 performs servo control on the pickup 10 in response to a servo signal output from the RF amplifier 23 and a servo control command output from the system controller 25. The PC I/F21 transmits data received from the DSP22 to the host. In addition, the system controller 25 may instruct the pickup 10 to read information regarding defect management from the write once recording medium 4 during a read operation. The system controller 25 manages the entire system during a recording/reading operation.

A defect management method for a write once recording medium will now be described.

The present invention introduces a consistency flag (hereinafter, referred to as 'C _ flag') that is information specifying a TDMS update cycle and a TDMS update cycle state, thereby determining whether defect management is abnormally stopped due to an abnormal event during recording of data on an information storage medium.

Fig. 6 illustrates a state of a write once recording medium on which defect management is performed according to an embodiment of the present invention. Referring to fig. 6, the TDMS describes two states of the write once recording medium: a TDMS update cycle open state having C _ flag ═ 1 'and a TDMS update cycle closed state having C _ flag ═ 0'. According to the state of the updated TDMS, the value of C _ flag is determined and recorded. When a write once recording medium is loaded into a recording medium drive and C _ flag regarding state information of an updated TDMS is '1', the drive recognizes an abnormal event of power down occurring during use of the recording medium and thus defect management is abnormally completed.

Defect management for write once recording media according to another embodiment of the present invention will now be described in detail with reference to fig. 4 and 6. First, when the write once recording medium 4 is loaded into the recording medium drive (operation 10), the TDMS update cycle reaches the state 100. The state 100 indicates that data has never been recorded on the write once recording medium 4 or that the write once recording medium 4 enters a TDMS update cycle off state having C _ flag ═ 0 recorded last in the TDMA when data has been recorded and defect management is successfully performed herein.

If data is never recorded on the write once recording medium 4, the controller 2 records C _ flag 0 and information for performing defect management using the recording medium drive in a first cluster of the first TDMA during initialization of the write once recording medium 4. C _ flag is recorded in the TDDS mentioned above with reference to fig. 2 and 3.

According to this embodiment, a TDDS having C _ flag of 1 is recorded and the write once recording medium 4 enters a state 110, such that a TDMS update cycle is opened in response to a host command or according to a recording/reading operation (operation 20), and the write once recording medium 4 enters a TDMA update cycle open state.

Two cases where the TDMS update cycle is open are as follows:

opening of TDMS update cycle on host command

When the write once recording medium 4 having C _ flag of 0, which contains the final TDMS, more specifically, the last recorded TDDS, is loaded into the recording medium drive, the controller 2 receives a command to open a TDMS update cycle from a host (not shown). Then, the controller 2 controls the recording/reading unit 1 to record the TDDS having C _ flag of 1 in the next TDMS position into the TDMS lastly recorded in the TDMA, thereby indicating the TDMS update cycle open state. In this case, the value of C _ flag changes, but other information such as the TDFL does not change. Accordingly, only the TDDS containing the changed C _ flag is recorded in a new cluster.

Opening TDMS update cycle according to record/read operation

When the write once recording medium 4 having the last recorded TDDS with C _ flag of '0' is loaded into the recording medium drive and recording or reading of data is ready, the host transmits a write/read command to the recording medium drive, and the recording medium drive performs the record/read command on the write once recording medium 4. If the TDMS needs to be updated during the recording/reading operation, the controller 2 controls the recording/reading unit 1 to record the TDDS having C _ flag 1 in the next TDMS position to the TDMS lastly recorded in the TDMA, thereby indicating the TDMS update cycle open state.

The TDMS is updated after the verify-after-write method once or several times or after a predetermined amount of data is written. At this time, the TDMS is updated to include C _ flag ═ 1 and recorded in the TDDS.

Similarly, when a cluster is determined to contain a defect during reading of data from the write once recording medium 4, defect management for updating the TDMS is also performed.

After the state 110 where the C _ flag is recorded as 1 and the TDMS update cycle is open, a recording/reading operation is performed (operation 30), and a new TDMS is created and stored in the memory 3. For efficient use of the TDMA, the controller 2 preferably performs updating of the TDMS by recording the TDMS in the TDMA only when a command to update the TDMS is given by the host (operation 50). At this time, the TDMS is updated so that C _ flag ═ 1 is included in the TDDS.

The state 120 indicates a disc state, i.e., a TDMS update cycle open state having C _ flag of 1, in which the TDMS can be updated during a recording/reading operation (operation 30). In state 120, when the host gives a command to update the TDMS (operation 50), the controller 2 updates the TDMS by including C _ flag 1 into the TDDS, and the TDMS update cycle reenters state 100.

After the TDMS update cycle is opened in response to a command to open the TDMS update cycle given by the host or according to a recording/reading operation, a command to eject the write once recording medium 4 from the recording medium drive or a command to close the TDMS update cycle is given (operation 40). Then, the controller 2 controls the recording/reading unit 1 to record the TDDS having C _ flag ═ 0 into the TDMA. Here, C _ flag ═ 0 indicates that the TDMS update cycle is closed. When the TDDS having C _ flag of 0 is recorded in the TDMA, the write once recording medium 4 enters the TDMS update cycle closed state 130.

If the host gives a command to close the TDMS update cycle instead of a command to eject the write once recording medium 4, the TDMS update cycle enters the state 130 and transitions back to the state 100. In the state 130, when the host gives a command to eject the write once recording medium 4, the write once recording medium 4 is ejected from the recording medium drive (operation 70).

In the state 130, if a user gives a command to finalize the write once recording medium 4, the controller 2 controls the recording/reading unit to record data such as "ffh" in a space of the TDMA, thereby preventing recording of data such as a TDMS in the TDMA, the TDMS containing a TDDS, a TDFL, or an SBM.

As mentioned above, according to this embodiment of the present invention, C _ flag indicating two states of the TDMS update cycle, i.e., the TDMS update cycle open state and the TDMS update cycle closed state, is recorded in the TDMS. Thus, it can be checked whether an abnormal event such as a power shortage in the recording medium drive occurs during the use of the write once recording medium 4. If a power shortage in the recording medium drive occurs during the use of the write once recording medium 4, the C _ fag indicating that the TDMS update cycle is open must be recorded last in the TDMA.

The TDMS is repeatedly recorded to increase reliability of data detection. For example, during the update of the TDMS, the TDMS is repeatedly recorded in consecutive clusters of the TDMA, or a new TDMS is recorded in the first TDMS and a copy of the new TDMS is recorded in the second TDMA.

Until now, defect management according to an embodiment of the present invention has been described with respect to a write once recording medium. However, the type of information storage medium on which defect management according to the present invention can be performed is not limited to this type of medium. That is, defect management for an information storage medium according to the present invention using an update cycle and cycle state information is not limited to updating of a TDMS of a write once recording medium.

As mentioned above, there is a case where an abnormal event such as a power failure occurs when a recording medium drive records information, which is generated in connection with data recording or data reading on a loaded information storage medium periodically or at any time during a recording/reading operation. In this case, the supply of power to the recording medium drive is interrupted and the recording of information is abnormally stopped. According to an embodiment of the present invention, when an information storage medium is reloaded into a recording medium drive, the recording medium drive determines abnormal termination of recording of information by referring to last update cycle state information.

Fig. 7 is a flowchart illustrating a defect management method for an information storage medium according to an embodiment of the present invention. The defect management shown in fig. 7 may be performed using a driver such as that shown in fig. 4 or 5. Hereinafter, a defect management method for an information storage medium according to an embodiment of the present invention will be described with reference to fig. 4 and 7.

First, in act 310, an information storage medium is loaded. In action 320, an update cycle of specific information related to data recording or data reading is opened. In this embodiment, the information storage medium may be, by way of non-limiting example, an optical recording medium such as a Digital Versatile Disc (DVD) or a hard disk.

In addition, information related to data recording or data reading is generated on an information storage medium during recording or reading of data and needs to be recorded on the information storage medium later for data reading. For example, the data may be an example of defect information regarding a data area of the information storage medium. As previously mentioned, defect information is recorded in a TDMS formed on a write once recording medium or a DMA formed on a rewritable recording medium.

In this embodiment, the update cycle of information is described as an open response to a command to open the update cycle or a write/read command given by a host (not shown). However, it should be understood that the condition for opening the update cycle may be set differently.

In action 330, when the update cycle of the information is turned on, the controller 2 controls the recording/reading unit 1 to record update cycle on state information in a predetermined area of the loaded information storage medium. The update cycle state information specifies the state of the update cycle using the coherency flag. If the value of the continuity flag is 1, the update cycle is turned on. If the value of the continuity flag is 0, the update cycle is closed.

In action 340, the controller 2 controls the recording/reading unit 1 to record data on or read data from the information storage medium.

In act 350, the controller 2 creates specific information that needs to be updated whenever data is recorded on or read from the information storage medium.

In action 360, the controller 2 determines whether the update cycle of the information is completed. If it is determined in act 360 that the update cycle is not completed, the defect management program returns to act 330, the information created in act 350 is recorded on the information storage medium, and the update cycle open state information is recorded thereon again.

However, if it is determined that the update cycle is completed, the information created in act 350 is recorded on the information storage medium, and the update cycle off state information is recorded thereon again in act 370.

When the update cycle state information is recorded in act 330 or act 370, it is preferable that the update cycle state information is incorporated into the information and the information is recorded on the information storage medium. If the update cycle on state information is recorded first after the information storage medium is loaded, the recorded information is compared with previously recorded information, in which only information in which the update cycle state information is changed from the update cycle off state information to the update cycle on state information is recorded.

As described above, defect management according to the disclosed embodiments of the present invention enables a recording medium drive to easily perceive abnormal termination of recording data on an information storage medium, which is caused by an event such as interruption of power supply to the recording medium caused by power failure, when the information storage medium is reloaded into the recording medium drive.

While several embodiments of the present invention have been shown and described, the present invention is not limited to the disclosed embodiments. It would be appreciated by those skilled in the art that changes may be made in this embodiment without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.

Claims (5)

1. A defect management method for an information storage medium having recorded thereon temporary defect management information including information on an update cycle state of a temporary defect management structure, comprising:

when the updating of the temporary defect management structure is completed, writing temporary defect management information including information indicating that the update cycle status of the temporary defect management structure is off to the information recording medium.

2. The method of claim 1, wherein the information on the update cycle status of the temporary defect management structure is designated as "on" or "off.

3. The method of claim 1, wherein the updating of the temporary defect management structure is done in response to a command to eject the information storage medium.

4. A defect management method for an information storage medium having recorded thereon temporary defect management information including information on an update cycle state of a temporary defect management structure, comprising:

reading temporary defect management information including information on an update cycle status of the temporary defect management structure from the loaded information storage medium; and

determining that defect management of the information storage medium is not normally completed when the temporary defect management information includes information indicating that an update cycle status of a temporary defect management structure is on.

5. The method of claim 4, wherein the information on the update cycle status of the temporary defect management structure is designated as "on" or "off.